Electric switch.



F. BARR.

ELECTRIC SWXTGH.

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1,1 12,883. Patented Oct. 6, 1914.

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ELECTRIC SWITCH.

Specification of Letters Patent.

Application filed April 29, 1912.

Patented Oct. 1914. Serial No. 693,936.

To all whom z't may concer-n.:

Be it known that I, FREDERIC BARR, a citizen of the United States, and resident of New York, in the county of Kings and State of New York, have invented certain new and useful Improvements in Electric Switches, of which the following is a specification.

y invention relates particularly to what are commonly termed pull socket switches. In constructions of this character it is customary to employ a metal chain for operating the oscillating member. The inner end of this chain is connected to an oscillating member inside of the shell or casing and the chain passes outside the shell through a guide or bell structure so as to permit the chain to be easily operated. It is my object to rovide an oscillating guide or bell prefera ly of porcelain of such a construction that the parts may be made at reasonable cost and may be assembled or taken apart when desired.

In the preferred form the block which carries the parts of the switch is formed in two parts connected together by screws. The chain guide is formed of a separate piece of porcelain or other suitable insulatmg material which is secured in place by one of the screws and the relative shape of the parts.

Figure 1, is a side view of a lamp socket switch embodying the improvements of m invention. Fig. 2, shows a shell in a longitudinal sectional view and the interior part in side elevation. Fig. 3, is a plan view of the switch block proper. Fig. 4, is a horizontal sectional view on the plane of the line X X of Fig. 2. Fig. 5, 1s a side view showing the parts separated. Fig. 6, is a plan view of the lower part of the insulating switch block. Fig. 7 is a side view of a modification. Fig. 8, is a horizontal section of the modification of Fig. 7 on the plane of the line Y Y.

The shell or casing is preferably formed in two arts, the body l telescoping inside of the ange of the cap 2 and the parts bein detachably secured together in any suitable manner. The body is slotted as indicated at 3 to allow for the chain guide 4.

The switch parts are carried by an insulating block consisting of the base 5 and the cap 6. The form shown is what may be termed a double break switch having the stationary switch contacts 7 and 8 located on opposite sides of the central spindle 9. These switch contacts are secured to the b ase 5 by means of screws 10 andr 11 respectlvely which pass upward through the base, through the feet of the switch contacts and screw into the plates 12 and 13 respectively A plate 14 is secured to the base by means of a screw 15 which passes upward through 'the base. The plates 12 and 14 respectively have threaded sockets or holes 16 and 17 to receive the screws 18 and 19 which pass down through the upper porcelain. The two parts of the switch block are therefore held together by the screws 18 and 19.

The switch member 2O is mounted under the carrier 21 which is rotatable on the spindle 9. The lever 22 is mounted on the spindle 9 and held yieldingly in the position shown by means of a spring 23 so that the lever presses a ainst the shoulder 24. This lever is provi ed with a ratchet plate 25 which is adapted to rotate the carrier 21 and the switch member 20 step by step. The chain 26 is connected to the outer end of the operating lever 22 so that the operating lever may be turned anti-clockwise by a pull on the chain. When the chain is reeased the spring 23 throws the lever backward to its position of rest.

The chain guide 4 as before mentioned, preferably of porcelain, has a base 27 which rests on the floor 28 of the base 5. One end preferably fits against the shoulder 29 of the base 5 and the other end or arm 3() tits beneath the ed e 31 of the upper porcelain member 6. T e arm 30 has a vertical passage 32 to receive the screw 19. The upper ed e 33 fits beneath the lower face 34 when t e parts are assembled. This holds the parts rigidly in place without danger of fracture. The rear of the chain guide 1s grooved at 35 to accommodate the chain more smoothly. The inner part of the upper edge is cut away or grooved at 36 to allow for the movement of the lever 22.

In the form shown in Figs. 7 and 8 the base of the chain guide 4 is dove-tailed as at 40 and 41 to fit corresponding shoulders between the base member 5 and the upper member 6 so that when the parts of the insulating block are secured together by means of screws 18 and 19 as previously mentioned, the chain guide cannot fall out. In this construction the base 5 is provided with a lug 42 for limiting the inward movement of the chain guide so that thechain guide is held in its proper relative position when the parts 5 and 6 of the insulatin block are secured together. In both of t ese forms of construction it will be noted that theq chain guide being of insulating material completely il'lsulates the chain from the shell ot' the socket. The chain guide being secured to the insulating block is removable therewith from the shell or casing. The advantages of this construction will be apparent to those who are skilled in this art.

lVhat I claim is:

l. In a pull switcln an insulating block provided with an annular insulating wall inclosing a switch chamber and extending only part way around such switch chamber thereby leaving an opening in the side of the block, an insulating chain guide colnprising an insulating base fitting in the opening in the side of the block and a projecting tubular guiding portion carried by said base. the said insulating base of the chain guide being substantially the thickness of the annular insulating wall and disposed in the opening to form a continuation of the said annular' insulating wall of the block, with its outer surface flush with and conforming to the exterior surface of the insulating block and its inner surface substantially fiush with the inner surface of the annular wall and shaped to guide and direct the chain into the tubular projecting portion of the chain guide, means securing the chain guide in position in the opening with its insulating base forming an insulating continuation of the insulating wall of the block and a metallic shell inclosing the block and iitting the exterior of the block and thereby engaging with the insulating base of the chain guide fiush with the exterior of the block to brace the insulating chain guide against breakage, said shell having an opening therein through which the insulating tubular guidin portion of the chain guide projects, where y to carry a pull chain from the switch chamber out through the Inetallie shell and completely insulated therefrom.

2. In a pull switch, the combination with an insulating block provided with a switch receiving chamber and with an annular wall partially inclosing said chamber and having an opening in one side for the passage of a switch operating chain, of a chain guide having a base fitting in the said chain opening and a screw passing down through the inclosing wall and through the base of the chain guide seated in the opening in said wall to thereby secure the chain guide in place.

3. In a pull switch, an insulating switch block formed in two parts, an insulating chain guide having a base fitting in be- Atweeh the two parts of the switch block with the other part of the switch block to thereby secure the two parts oi the block and the guide together'.

i. In a pull switch, an insulating block having a chalnber for the switchmechanism and a wall partially inclosing said chamber provided with an opening around one side for the passage of a switch operating chain, an insulating chain guide fitting in said opening and having a base portion forming substantially a continuation of the insulating inclosing wall7 an oscillating switch operating member and a chain secured thereto and extending through said guide, said guide being grooved on the inner wall of its base portion for said chain and said operating member- 5. In a pull switch, the combination with a switch block formed in two parts, of a chain guide having an insulated portion engaged between the two parts of the block, and a current carrying screw securing the two parts of the block together and passing through the insulated portion of the chain guide to thereby secure the chain guide to the block.

6. In a pull switch, an insulating block formed in two parts, a plate secured to one part and having a screw socket, an insulating chain guide having a passage and a screw passing through the other part of the insulating block and through said passage and screwed into said screw socket for holding said parts together.

7. In a pull switch, an insulating block made in two parts with a switch chamber between them and with a chain opening at one side of the said chamber, a chain guide made of insulating material having a base fitting in the opening between the two parts of the switch block, the said base having a lateral extension at one side of the chain guide opening therein, a screw passed down through the upper part of the insulating block and through the lateral extension of the chain guide base and a screw socket carried by the lower part of the insulating block, disposed beneath the lateral extension of the chain guide base and in which the screw engages to thereby fasten the two parts of the insulating block together with the chain guide base therebetween.

FREDERIC BARR.

Witnesses:

R. S. ALLYN, E. BRADFORD.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

